mirror of https://github.com/fralalonde/dipstick
261 lines
7.9 KiB
Rust
Executable File
261 lines
7.9 KiB
Rust
Executable File
//! Standard stateless metric Inputs.
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// TODO parameterize templates
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use crate::attributes::{Attributes, Buffered, MetricId, OnFlush, Prefixed, WithAttributes};
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use crate::input::InputKind;
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use crate::name::MetricName;
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use crate::Flush;
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use crate::{CachedInput, QueuedInput};
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use std::fs::{File, OpenOptions};
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use std::io::{self, Write};
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use std::path::Path;
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use std::sync::Arc;
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#[cfg(not(feature = "parking_lot"))]
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use std::sync::RwLock;
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#[cfg(feature = "parking_lot")]
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use parking_lot::RwLock;
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use crate::{Formatting, Input, InputMetric, InputScope, LineFormat, SimpleFormat};
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/// Buffered metrics text Input.
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pub struct Stream<W: Write + Send + Sync + 'static> {
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attributes: Attributes,
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format: Arc<dyn LineFormat + Send + Sync>,
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inner: Arc<RwLock<W>>,
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}
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impl<W: Write + Send + Sync + 'static> QueuedInput for Stream<W> {}
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impl<W: Write + Send + Sync + 'static> CachedInput for Stream<W> {}
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impl<W: Write + Send + Sync + 'static> Formatting for Stream<W> {
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fn formatting(&self, format: impl LineFormat + 'static) -> Self {
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let mut cloned = self.clone();
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cloned.format = Arc::new(format);
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cloned
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}
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}
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impl<W: Write + Send + Sync + 'static> Stream<W> {
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/// Write metric values to provided Write target.
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pub fn write_to(write: W) -> Stream<W> {
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Stream {
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attributes: Attributes::default(),
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format: Arc::new(SimpleFormat::default()),
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inner: Arc::new(RwLock::new(write)),
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}
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}
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}
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impl Stream<File> {
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/// Write metric values to a file.
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#[deprecated(since = "0.8.0", note = "Use write_to_file()")]
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#[allow(clippy::wrong_self_convention)]
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pub fn to_file<P: AsRef<Path>>(file: P) -> io::Result<Stream<File>> {
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Self::write_to_file(file)
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}
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/// Write metric values to a file.
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pub fn write_to_file<P: AsRef<Path>>(file: P) -> io::Result<Stream<File>> {
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let file = OpenOptions::new()
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.write(true)
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.create(true)
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.append(true)
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.open(file)?;
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Ok(Stream::write_to(file))
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}
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/// Write metrics to a new file.
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///
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/// Creates a new file to dump data into. If `clobber` is set to true, it allows overwriting
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/// existing file, if false, the attempt will result in an error.
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#[deprecated(since = "0.8.0", note = "Use write_to_new_file()")]
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#[allow(clippy::wrong_self_convention)]
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pub fn to_new_file<P: AsRef<Path>>(file: P, clobber: bool) -> io::Result<Stream<File>> {
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Self::write_to_new_file(file, clobber)
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}
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/// Write metrics to a new file.
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///
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/// Creates a new file to dump data into. If `clobber` is set to true, it allows overwriting
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/// existing file, if false, the attempt will result in an error.
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pub fn write_to_new_file<P: AsRef<Path>>(
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file: P,
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clobber: bool,
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) -> io::Result<Stream<File>> {
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let file = OpenOptions::new()
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.write(true)
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.create(true)
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.create_new(!clobber)
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.open(file)?;
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Ok(Stream::write_to(file))
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}
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}
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impl Stream<io::Stderr> {
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/// Write metric values to stderr.
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#[deprecated(since = "0.8.0", note = "Use write_to_stderr()")]
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pub fn to_stderr() -> Stream<io::Stderr> {
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Stream::write_to(io::stderr())
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}
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/// Write metric values to stderr.
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pub fn write_to_stderr() -> Stream<io::Stderr> {
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Stream::write_to(io::stderr())
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}
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}
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impl Stream<io::Stdout> {
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/// Write metric values to stdout.
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#[deprecated(since = "0.8.0", note = "Use write_to_stdout()")]
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pub fn to_stdout() -> Stream<io::Stdout> {
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Stream::write_to(io::stdout())
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}
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/// Write metric values to stdout.
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pub fn write_to_stdout() -> Stream<io::Stdout> {
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Stream::write_to(io::stdout())
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}
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}
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// FIXME manual Clone impl required because auto-derive is borked (https://github.com/rust-lang/rust/issues/26925)
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impl<W: Write + Send + Sync + 'static> Clone for Stream<W> {
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fn clone(&self) -> Self {
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Stream {
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attributes: self.attributes.clone(),
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format: self.format.clone(),
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inner: self.inner.clone(),
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}
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}
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}
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impl<W: Write + Send + Sync + 'static> WithAttributes for Stream<W> {
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fn get_attributes(&self) -> &Attributes {
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&self.attributes
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}
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fn mut_attributes(&mut self) -> &mut Attributes {
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&mut self.attributes
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}
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}
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impl<W: Write + Send + Sync + 'static> Buffered for Stream<W> {}
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impl<W: Write + Send + Sync + 'static> Input for Stream<W> {
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type SCOPE = TextScope<W>;
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fn metrics(&self) -> Self::SCOPE {
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TextScope {
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attributes: self.attributes.clone(),
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entries: Arc::new(RwLock::new(Vec::new())),
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input: self.clone(),
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}
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}
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}
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/// A scope for text metrics.
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pub struct TextScope<W: Write + Send + Sync + 'static> {
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attributes: Attributes,
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entries: Arc<RwLock<Vec<Vec<u8>>>>,
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input: Stream<W>,
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}
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impl<W: Write + Send + Sync + 'static> Clone for TextScope<W> {
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fn clone(&self) -> Self {
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TextScope {
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attributes: self.attributes.clone(),
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entries: self.entries.clone(),
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input: self.input.clone(),
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}
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}
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}
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impl<W: Write + Send + Sync + 'static> WithAttributes for TextScope<W> {
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fn get_attributes(&self) -> &Attributes {
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&self.attributes
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}
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fn mut_attributes(&mut self) -> &mut Attributes {
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&mut self.attributes
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}
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}
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impl<W: Write + Send + Sync + 'static> Buffered for TextScope<W> {}
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impl<W: Write + Send + Sync + 'static> InputScope for TextScope<W> {
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fn new_metric(&self, name: MetricName, kind: InputKind) -> InputMetric {
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let name = self.prefix_append(name);
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let template = self.input.format.template(&name, kind);
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let entries = self.entries.clone();
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let metric_id = MetricId::forge("stream", name);
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if self.is_buffered() {
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InputMetric::new(metric_id, move |value, labels| {
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let mut buffer = Vec::with_capacity(32);
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match template.print(&mut buffer, value, |key| labels.lookup(key)) {
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Ok(()) => {
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let mut entries = write_lock!(entries);
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entries.push(buffer)
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}
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Err(err) => debug!("{}", err),
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}
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})
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} else {
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// unbuffered
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let input = self.input.clone();
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InputMetric::new(metric_id, move |value, labels| {
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let mut buffer = Vec::with_capacity(32);
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match template.print(&mut buffer, value, |key| labels.lookup(key)) {
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Ok(()) => {
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let mut input = write_lock!(input.inner);
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if let Err(e) = input.write_all(&buffer).and_then(|_| input.flush()) {
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debug!("Could not write text metrics: {}", e)
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}
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}
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Err(err) => debug!("{}", err),
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}
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})
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}
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}
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}
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impl<W: Write + Send + Sync + 'static> Flush for TextScope<W> {
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fn flush(&self) -> io::Result<()> {
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self.notify_flush_listeners();
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let mut entries = write_lock!(self.entries);
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if !entries.is_empty() {
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let mut input = write_lock!(self.input.inner);
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for entry in entries.drain(..) {
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input.write_all(&entry)?
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}
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input.flush()?;
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}
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Ok(())
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}
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}
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impl<W: Write + Send + Sync + 'static> Drop for TextScope<W> {
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fn drop(&mut self) {
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if let Err(e) = self.flush() {
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warn!("Could not flush text metrics on Drop. {}", e)
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}
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::input::InputKind;
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use std::io;
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#[test]
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fn sink_print() {
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let c = super::Stream::write_to(io::stdout()).metrics();
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let m = c.new_metric("test".into(), InputKind::Marker);
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m.write(33, labels![]);
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}
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}
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